Disconnects have stopped for now. I did all of the following Reset ui (renamed wtf, delete cache folder), all addons updated for 5.0.4, reset router (most likely cause). There was a patch today but I don't know if it mattered. I played for about an hour today and did not see players from other realms. I think the router was at fault. Perhaps it required a reset after the 5.0.4 patch. Usually pretty reliable with the DD-WRT firmware.